This gives [1] for row zero and [1, 12, 66, 220, 495, 792, 924, 792, 495, 220, 66, 12, 1] for row 12:

def getRow(r): 
  row = [1]
  for c in range(1,r+1): 
     row += [row[-1]*(r-c+1)//c]
  return row